DM2_Read (FB)

FUNCTION_BLOCK DM2_Read EXTENDS DM1_Read

This function block reads DM2 messages from a given device (itfSourceECU) as long as xEnable is TRUE. In principal a DM2 message contains lamp information and all previously active diagnostic trouble codes (DTC). Following information is provided by this function block:

Lamp information for following lamps:
- Malfunction Indicator Lamp(MIL)
- Red Stop Lamp (RSL)
- Amber Warning Lamp (AWL)
- Protect Lamp
Number of previously active DTCs(output: udiDTCCount)
Information about if DM2 message was received in the current PLC cycle (xReceived).

For detailed information about received DTC data one or more DTC Handlers can be connected with this function block (optionally). For example:

DTCBufferWriter: Writes DTC data to a given memory buffer
DTCLogger: Writes DTC data to the PLC log.

InOut:

Scope	Name	Type	Initial	Comment	Inherited from
Input	xEnable	BOOL		TRUE: Action starts FALSE: Action stops, outputs xDone, xBusy, xError are resetted	LTrig
Output	xDone	BOOL		TRUE: Action successfully completed	LTrig
	xBusy	BOOL		TRUE: Function block active	LTrig
	xError	BOOL		TRUE: Error occurred, function block aborts action FALSE: No error	LTrig
Input	itfSourceECU	IJ1939RemoteECU		ECU which sends this message	DM1_Read
Output	itfDTCHandlerList	IDTCHandlerList	THIS^	mainly for graphical programming: output for optional connection to DTC Handler	DM1_Read
	udiDTCCount	UDINT		Contains number of received Diagnostic Trouble Codes.	DM1_Read
	MalfunctionIndicatorLamp	LAMP_INFO		Malfunction Indicator Lamp: Lamp to indicate when there is an emission related trouble code active.	DM1_Read
	RedStopLamp	LAMP_INFO		Red Stop Lamp: Lamp to indicate a problem that is severe enough to warrant stopping the vehicle.	DM1_Read
	AmberWarningLamp	LAMP_INFO		Amber Warning Lamp: Lamp to indicate a problem with the vehicle system but the vehicle does not need to be stopped immediately.	DM1_Read
	ProtectLamp	LAMP_INFO		Protect Lamp: Lamp to indicate a problem with a vehicle system that is most likely not electronic subsystem related (e.g. Coolant Temperature has exceeded its defined range.)	DM1_Read
	xReceived	BOOL		If a DM message was received xReceived is TRUE for one cycle.	DM1_Read
	eError	ERROR		detailed error information if xError is TRUE	DM1_Read